16565321376000 has 864 divisors, whose sum is σ = 61147411573248. Its totient is φ = 4303776153600.

The previous prime is 16565321375983. The next prime is 16565321376011. The reversal of 16565321376000 is 67312356561.

16565321376000 is a `hidden beast` number, since 1 + 6 + 5 + 6 + 5 + 3 + 2 + 1 + 37 + 600 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5659486537 + ... + 5659489463.

Almost surely, 2^{16565321376000} is an apocalyptic number.

16565321376000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16565321376000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30573705786624).

16565321376000 is an abundant number, since it is smaller than the sum of its proper divisors (44582090197248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16565321376000 is a wasteful number, since it uses less digits than its factorization.

16565321376000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3464 (or 3437 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 45.

The spelling of 16565321376000 in words is "sixteen trillion, five hundred sixty-five billion, three hundred twenty-one million, three hundred seventy-six thousand".